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參數(shù)資料
| 型號(hào)： | TDC1044AB9C |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | ADC |
| 英文描述： | Monolithic Video A/D Converter 4-Bit, 25 Msps |
| 中文描述： | 1-CH 4-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CDIP16 |
| 封裝： | CERAMIC, DIP-16 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 79K |
| 代理商： | TDC1044AB9C |
PRODUCT SPECIFICATION
TDC1044A
9
Applications Discussion
Calibration
To calibrate the TDC1044A, adjust V
RT
and V
RB
to set the
1st and 15th thresholds to the desired voltages. Assuming a
0V to -1V desired range, continuously strobe the converter
with -0.0033V (1/2 LSB from 0.000V) on the analog input,
and adjust V
RT
for output toggling between codes 0000 and
0001. Then apply -0.976V (1/2 LSB from -1.000V) and
adjust V
RB
for toggling between codes 1110 and 1111.
Instead of adjusting V
RT
, R
T
can be connected to analog
ground and the 0V end of the range calibrated with an ampli-
fier offset control. R
B
is a convenient point for gain adjust-
ment that is not in the analog signal path.
Typical Interface Circuit
The TDC1044A does not require a special input buffer
amplifier to drive the analog input because of its low input
capacitance. A terminated low-impedance transmission line
(<100 Ohms) connected to the V
IN
terminal of the device is
sufficient if the input voltage levels match those of the A/D
converter.
However, many driver circuits lack sufficient offset control,
drive current, or gain stability. The typical interface circuit in
Figure 4 shows a simple amplifier and voltage reference cir-
cuit that may be used with the device. U2 is a wide-band
operational amplifier with a gain factor of -1. As the video
input increases from zero to one volt, VIN of the TDC1044A
decreases from zero to -1 volt. With true binary selected
(NMINV = 1 and NLINV = 1), output codes increase from
0000 to 1111.
A small value resistor, R12, serves to isolate the small input
capacitance of the A/D converter from the amplifier output
and insure frequency stability. Pulse and frequency response
of the amplifier are optimized by variable capacitor C12. The
reference voltage for the TDC1044A is generated by ampli-
fier U3. System gain is adjusted by varying R9, which con-
trols the reference voltage level to the A/D converter.
Input voltage range and input impedance for the circuit are
determined by resistors R1 and R2. Formulas for calculating
values for these input resistors are:
and
where V
R
is the input voltage range of the circuit, Z
IN
is the
input impedance of the circuit, and the constant 1000 comes
from the value of R3. As shown, the circuit is set up for
1Vp-p 75 Ohm video input.
R1
-----------
Z
IN
è
1000
---1
–
----------------1
=
R2
Z
IN
1000
R1
+
1000 R1
è
–
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TDC1044A | Monolithic Video A/D Converter 4-Bit, 25 Msps |
| TDC1044AN9C | Monolithic Video A/D Converter 4-Bit, 25 Msps |
| TDC1044AR4C | Monolithic Video A/D Converter 4-Bit, 25 Msps |
| TDC1046 | 6-Bit, 25 Msps Monolithic Video A/D Converter(6位,25Msps 單片視頻A/D轉(zhuǎn)換器) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDC1044AN9C | 制造商:Rochester Electronics LLC 功能描述: |
| TDC1044AR4C | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| TDC1044AR4C_32 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| TDC1044AR4CT WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| TDC10-4A | 制造商:Cooper Bussmann 功能描述:Quick blow F LBC min fuse,4A 6.3x32mm |
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